<html>
    <body>
        <h1>欢迎登录!${user.username }</h1>
        <form action="${pageContext.request.contextPath }/loginUser" method="post">
            <input type="text" name="username"><br>
            <input type="password" name="password"><br>
            <input type="submit" value="提交">
        </form>
    </body>
</html>